If a coin is even, and the possibility of the occurrence of showing the head and the tail are equal. What is the probability that the head shows up at least one time?
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A$$\frac{1}{4}$$
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B$$\frac{1}{2}$$
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C$$\frac{3}{4}$$
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D$$\frac{1}{8}$$
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E$$\frac{7}{8}$$
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正确答案: C